I’d bet, in addition to the other answers here, there’s a metabolic aspect too. The brain using calories as glucose, and actively listening and focusing on learning probably takes more mental effort than more passively watching a movie. And there’s only so much glucose the brain can store/make. So you run out of calories faster, fatigue hormones build up, you feel tired. Although, this is probably a more Minor aspect.
Because it’s voluntary (genuine) interest vs forced interest. You can pursue an educational interest with just as much fervor if it’s something that genuinely interests you. Something you’re truly curious about.
But also because movies/video games/books are often specifically designed to engross us, where as normal activities in life are not.
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